w83c554f Winbond Electronics Corp America, w83c554f Datasheet - Page 91

• Manufacturer Part Number: w83c554f
• Description: System I/o Controller With Pci Arbiter & Ultradma/33 Ide Controller
• Manufacturer: Winbond Electronics Corp America

W83C554F
Scatter/Gather Command Registers (default = 000000h)
Function:
Type:
Bit Description:
WINBOND ELECTRONICS CORP. AMERICA
Bit 7:
Bit 6:
Bits [5:2]:
Bits [1:0]:
Each of these three registers controls the Scatter/Gather operation of DMA channels [7:5], [3:0].
Write only
IR13EOPSEL. IRQ13/EOP Select. If enabled via bit 6 of this register, bit 7 selects whether
EOP or IRQ13 is asserted at termination caused by a last buffer expiring. If bit 7 = 1, EOP is
asserted; otherwise IRQ13 is asserted.
IRQ13EOPEN. IRQ13/EOP Programming Enable. If bit 6 = 1, it enables IRQ13/EOP
programming and allows initialization or modification of the Scatter/Gather termination handling
bits.
Reserved. Must be 0.
Scatter/Gather Commands.
Bit 1
0
0
1
1
0
0
1
0
1
Command
No Scatter/Gather operation.
Start Scatter/Gather.
Stop Scatter/Gather. This will halt a transfer immediately.
Reserved.
Register Information
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